non blocking kbhit()

[Joao Cardoso]

Hi,

Could it be possible to have a non-blocking kbhit() in such a way that
if no character is available it returns imediatly?

This could be usefull on iterative scripts where one does not know in
advance when to stop the iteration. Then one could do:

   while (mse > min_mse & !kbhit)
      iterate
   endwhile

to iterate in an unatended mode, and stop it when pressing a key.

To retain compatibility, `kbhit' without arguments should work in the
normal blocking mode.

Joao



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